2008 Ritchey Z-Max Intuition Pro 26" x 2.0" tire Aramid Bead Black 2008 Z-MaxIntuition Pro 26" x 2.0" tire Aramid Bead Black A re-design of the original Ritchey QUAD tire, the Intuition is a versatile design. Center knobs will both sink in loose dirt and bite or stand up on hard-packed surfaces ! ISO Diameter: 559 ISO Width:51 mm PSI: 35-65 PSI Weight: 500g